Daniel B. Steffen

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Plano, TX, US

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Patents Grantslast 30 patents

Information Patent Grant
Variable speed fan motor control for forced air heating/cooling system
- Patent number 6,684,944
- Issue date Feb 3, 2004
- Hoffman Controls Corp.
- Howard P. Byrnes
- F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
Information Patent Grant
Variable speed fan motor control for forced air heating/cooling system
- Patent number 6,070,660
- Issue date Jun 6, 2000
- Hoffman Controls Corp.
- Howard P. Byrnes
- F24 - HEATING RANGES VENTILATING